I downloaded the demo from Adobe website, but cannot get both audio and video to export in one clip.

I've selected DV PAL, standard 48kHz from the opening window. I can capture the movie from the Sony camera with both sound and video and drag them onto the timeline without a problem.

But when I try to export the clip, the box says audio is disabled. When I click settings, the audio box is unchecked and is grayed out.

So is this just in the demo version? Or am I being thick? Adobe only mentions that the demo will last 30 days, but says nothing about features being disabled.
Audio export The option is grayed out